Pump



DUDLEY EAB/RAND, NEWARK, NEW JERSEY.

Specification of Letters Patent.

Patented June s, 1920.

Application filed October 23, 1917. vSerial No. 198,008.

To all 'whom t may concern Be it known that I, DUDLEY FARRAND, a citizen of the United States, residin at Newark, in the county of Essex and tate of New Jersey, have invented certain new and useful Improvements in Pumps; and 1 do hereby declare the following to be :a full,

clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to characters of reference marked thereon, which form a part of this` specification.

The present invention relates, generally, to pumps; and the invention has reference, more particularly, to a novel construction of pumps for lifting, conveying or propelling corrosive fluids.

The invention has to provide a simple, cheap and effective construction of pumping mechanism for pumping corrosivefluids, either in liquid or gaseous form; the novel construction of such pumping mechanism being so arranged that the effective operation of the suction and force strokes of a reciprocating piston may be utilized, while said piston and its cylinder is protected against direct contact with ,the corrosive fluid, thus preventing corrosion, scoring and other evil effects upon the piston and its cylinder tending to render the same leaky and inoperative.

Another object of the 'present invention is to provide a novel means for thoroughly lubricating the piston and cylinder of the pumping device.

Other objects of the present invention,

i not at this time more particularly enumerated, will be clearly understood from the4 following detailed description of the same.

The said invention consists, primarily, in the novel pumping mechanism hereinafter set forth; and the invention consists, furthermore, in the several novel arrangements and combinations of the, various devices and parts, as well as in the details of the construction of said parts, all of which will be hereinafter more fully described and claimed.

The invention is clearly illustrated in the accompanying drawing, which discloses a longitudinal vertical section of the essential parts and arrangements of my novel pumping mechanism, made according to and emfor its `principal object i vbodying the principles of my present `inl vention.

.Referring now to the said. drawing, the reference character 1 indicates a cylinder of any suitable construction, within which is mounted a piston 2 adapted to be reciprocated therein. Said piston'Q is provided,

preferably, with the usual piston-ring 3, A

,adapted to render the sliding fit of the same withinl the cylinder snug and non-leaking. The piston is adapted to be reciprocated by any suitable crank-device, .as 4, operatingthrough a suitable connecting-rod 5.

The reference character 6 indicates a substantially U-shaped tubular casing, th h w1 t e tical arm 7 of which isconnecte lower end of said cylinder 1, in direct communication therewith, and` the opposite vertical arm 8 of which is .connected with devices subsequently to be described. The interior of said U-shaped tubular casing 6 provides a continuous passageA 9 forming a continuation of the cylinder bore, and is preferably, although not necessarily, of the same diameter as the bore of said cylinder.

Connected with the free upper end of said vertical arm 8 of the U-shaped tubular casing 6 is a casing 10, interiorly divided to provide an intake well or chamber 11 on one side, and an outlet well or chamber 12 on the other side. The bottom wall 13 of said -casing 10, as connected with said vertical arm 8 of the U-shaped tubular casing, closes over the end of the passage 9 ofthe latter. Said bottom wall 13 is provided with an intake valve port 14, normally closed by a spring-pressed valve member 15.

path of communication between said intake well or chamber 11 and said passage 9. Said bottom wall 13 is further provided with an outlet valve port 16, normally closed by a spring-pressed valve member 17. Said'outlet valve port 16 is located to afford a path of communication between said passage 9 and said outlet well or chamber 12, Connected with saidcasing 10, so as to communicate with said intake well or chamber 11, is a lateral tubular extension 18, with which may be connected the conduit leading the corrosive fluid to be pumped from its source of supply: and connected with said casing 10, so as to communicate with said outlet well or chamber 12, is a lateral tubular extension 19, with which may be con- Said iny 'I vtake valve port 14 is located to afford a nected the conduit leading the corrosive fluid pumped to Athe desired point of deliver or distribution.

lfhe U-shaped tubular casing 6 is provided within its passage 9 with a volume or column of liquid 20, such as water, mercury, or any other liquid whose specific gravity is greater than the specific gravity of the, corrosive fluid to be pumped. Placed between the ad jacent end of the volume or column of liquid 20 and the inner end of the pistonv 2 is a small volume or column of oil 21, which servesv both as a lubricant for the piston 2 as well as a protecting cover for the piston. The combined volume of the column of oil 21 and liquid 20 is so determined, that the limit of the downward or inward stroke of the piston 2 will force or propel the liquid .24; and, furthermore, said cylinder is provided with an air-escape pipe25 communicating with its interior or bore, said escape pipe 25 having a suitable closing valve 26.

After the proper quantity of liquid 2O has been introduced within the U-shaped tubular casing 6, the piston being raised to just clear the points of communication of the feed-pipe andthe air escape pipe with the interior of the cylinder, the valves" of said respective pipes being open, oil is poured into the funnel portion 24, so as to cause the same to flow into the space between the column of liquid 20. and the bottom of lthe piston 2, the air which the incoming oil dislplaces being driven out through the air escape pipe 25, until the oil column is completely formed, the valves in the air and oil pipes being thereupon closed. It will be clear that since the oil 21 and liquid 20 will not intermiX, the lubricating and protecting covering of oil is always maintained next to the bottom of the piston 2. It is also necessary to provide the U-shaped tubular member 6 with a vertical arm 7 of such lengthV that when the oil is driven downward therein by the limit of` the 'downward stroke of the piston 2, it will not be carried far enough down to permit its escape through the lateral or horizontal portion of said U-shaped tubuments as inscribed upon the accompanying drawing.

In operation, .upon the upward or suctionV stroke of the piston 2 the column of liquid 20 is drawn rearwardly through the `U- I shaped tubular casing 6, and its outer end is sucked downwardly in the arm 8 to the downward limit. This movement of the liquid 20 causes a suction within the outer end of the passage 9, beyond said outer end of the column of liquid 20, which causes the valve 15 to open, and which consequently sucks downward the oppositely arranged valve 17 to closing position, whereupon a volume of the corrosive fluid to be pumped is drawn downwardly from the intake well or chamber 11, through the valve port 14 and into said 'passage 9. Upon the down ward or force stroke of the piston 2 the column of liquid 20 is forced forward through the U-shaped tubular casing 6, and its outer end is forced upwardlyvin the arm 8. to the upward limit. ThisI movement of the liquid 2O causes a compression of the corrosive fluid lwithin the outer end of the passage 9, beyond said outer end of the column of liquid 20, which causes the valve 17 to lift to open position, and which consequently forces the valve 15 to closing por sition, whereupon the corrosive fluid within the passage'9 is forced upwardly through the valve port 16 "into the outlet well or chamber 12. In this manner the repeated reciprocations of the piston acting upon the column of liquid 20 causes the corrosive fluid to be pumped from source of supply to oint of delivery, as will be clearly understoo Since the column of liquid 20 is vinterposed between the piston 2 and the corrosive fluid pumped', the latter cannot come in contact Vwith the piston, and. thereby inflict any damaging action thereupon; and since the liquid 20 is always to be selected with a view to its imperviousness to mixture with the corrosive fluid pumped, and since the liquid 20 selected is preferably of a greater specific cases, be successfully used alone, in place of the combined column ofl oil and liquid 20.

i I am aware that some changes may be made in the various arrangements and combinations of the'several devices vand parts of my present invention, as well'as in the details of the construction thereof, without departing from the scopethereof as defined in the appended claims.l Hence, I do not limit my invention to the exact arrange ments and combinations of the several devices and parts as described in the foregoing specification, nor' do I confine myself to v the exact details of the construction of said parts as illustrated in the accompanying drawings.

I claim l. In a device for pumping corrosive iuids, a U-shaped tubular member, a piston adapted to be reciprocated in one vertical arm of said U-shaped tubular member, a casing provided with an intake well'and an outlet well connected with the free end of the opposite vertical arm of said U-shaped tubular member, said casing having an intake valve closed port leading from said intake well into the end ofl said U-shaped tubular member, said casing having furthermore an outlet valve closed port leading from the end of said U-shaped tubular member into said outlet well, a volume of liquid of greater specific gravity than the corrosive fluid to be pumped within said U-sliaped tubular member adapted to` be reciprocated therein by the suction and force strokes of said piston for the purposes described, a volume of oil interposed between the inner end of said piston and the adjacent end of the volume of said liquid, and means for introducing said oil beneath said piston, the length'of said first mentioned vertical arm of said U-shaped tubular member being such that the downward limit of movement of -said oil when reciprocated by the piston is maintained within said vertical arm of said U-shaped tubular member.

2. In a device for pumping corrosive fluids, a U-shaped tubular member, a piston adapted to be reciprocated in one vertical arm of said U-shaped tubular member, a casing provided with an intake well and an outlet well connected with the free end of the opposite vertical arm of said U-shaped tubular member, said casing having an intakel valve closed port leading from said intake well into the end of said U-shaped tubular member, said casing having furthermore an outlet valve closed port leading from the end of said U-shaped tubular member into said outlet well, a volume of liquid of greater specific gravity than the corrosive fluid to be pumped within said U-shaped tubular member adapted to be reciprocated therein by the suction and force strokes of said piston for the purposes described, and a volume of oil interposed between the inner end of said piston and the adjustment end of the volume of liquid, the length of said first mentioned vertical arm of said U- shaped tubular member being such that the downward limit of movement of said oil when reciprocated by the piston is maintained within said vertical arm of said Ui shaped tubular member. l

In testimony that I claim the invention set forth above I have hereunto set my hand this 18th day of October, 1917.

DUDLEY FARRAND.

Witnesses:

FREDK FRaENTZEL, FREDK H. WV. FRAENTZEL. 

